Mobile station apparatus, base station apparatus, wireless communication method, and integrated circuit

A mobile station apparatus comprising:

• reception circuitry configured to receive, by using a higher layer message, information indicative of a first parameter for generation of a base sequence, wherein a demodulation reference signal is given by a cyclic shift and the base sequence, and the demodulation reference signal is associated with transmission of a physical uplink shared channel, and
• generation circuitry configured to:
• generate the base sequence which is given by a qth root Zadoff-Chu sequence in a case that a length of the demodulation reference signal is equal to or larger than 36, the number a being given by at least a sequence group number:
• determine the sequence group number without the first parameter in a case that the transmission of the physical uplink shared channel corresponds to a random access response grant as part of the contention based random access procedure or the transmission of the physical uplink shared channel corresponds to retransmission of a transport block as part of the contention based random access procedure, and
• generate the demodulation reference signal based on the cyclic shift and the base sequence.

A base station apparatus comprising:

• transmission circuitry configured to transmit, by using a higher layer message, information indicative of a first parameter for generation of a base sequence, wherein a demodulation reference signal is given by a cyclic shift and the base sequence, and the demodulation reference signal is associated with a transmission of a physical uplink shared channel;
• and
• reception circuitry configured to demodulate the physical uplink shared channel based on at least the demodulation reference signal,
• wherein the base sequence of the demodulation reference signal is given by a qth root Zadoff-Chu sequence in a case that a length of the demodulation reference signal is equal to or larger than 36, the number q being given by at least a sequence group number, and
• the sequence group number is determined based on at least the first parameter in a case that the transmission of the physical uplink shared channel corresponds to neither a random access response grant as part of a contention based random access procedure nor retransmission of a transport block as part of the contention based random access procedure.

A base station apparatus comprising:

• transmission circuitry configured to transmit, by using a higher layer message, information indicative of a first parameter for generation of a base sequence, wherein a demodulation reference signal is given by a cyclic shift and the base sequence, and the demodulation reference signal is associated with a transmission of a physical uplink shared channel;
• and
• reception circuitry configured to demodulate the physical uplink shared channel based on at least the demodulation reference signal,
• wherein the base sequence of the demodulation reference signal is given by a qth root Zadoff-Chu Sequence in a case that a length of the demodulation reference signal is equal to or larger than 36, the number q being given by at least a sequence group number,
• the sequence group number is determined without the first parameter in a case that the transmission of the physical uplink shared channel corresponds to a random access response grant as part of the contention based random access procedure or the transmission of the physical uplink shared channel corresponds to retransmission of a transport block as part of the contention based random access procedure.

A radio communication method used in a mobile station apparatus comprising:

• receiving, by using a higher layer message, information indicative of a first parameter for generation of a base sequence, wherein a demodulation reference signal is given by a cyclic shift and the base sequence, the demodulation reference signal is associated with transmission of a physical uplink shared channel,
• generating the base sequence which is given by a qth root Zadoff-Chu sequence in a case that a length of the demodulation reference signal is equal to or larger than 36, the number a being given by at least a sequence group number,
• determining the sequence group number based on at least the first parameter in a case that the transmission of the physical uplink shared channel corresponds to neither a random access response grant as part of a contention based random access procedure nor retransmission of a transport block as part of the contention based random access procedure, and
• generating the demodulation reference signal based on the cyclic shift and the base sequence.

A radio communication method used in a mobile station apparatus comprising:

• receiving, by using a higher layer message, information indicative of a first parameter for generation of a base sequence, wherein a demodulation reference signal is given by a cyclic shift and the base sequence, the demodulation reference signal is associated with transmission of a physical uplink shared channel,
• generating the base sequence which is given by a qth root Zadoff-Chu sequence in a case that a length of the demodulation reference signal is equal to or larger than 36, the number a being given by at least a sequence group number,
• determining the sequence group number without the first parameter in a case that the transmission of the physical uplink shared channel corresponds to a random access response grant as part of the contention based random access procedure or the transmission of the physical uplink shared channel corresponds to retransmission of a transport block as part of the contention based random access procedure, and
• generating the demodulation reference signal based on the cyclic shift and the base sequence.

A radio communication method used in a base station apparatus comprising:

• transmitting, by using a higher layer message, information indicative of a first parameter for generation of a base sequence, wherein a demodulation reference signal is given by a cyclic shift and the base sequence, the demodulation reference signal is associated with a transmission of a physical uplink shared channel, and
• demodulating the physical uplink shared channel based on at least the demodulation reference signal,
• wherein the base sequence of the demodulation reference signal is given by a qth root Zadoff-Chu sequence in a case that a length of the demodulation reference signal is equal to or larger than 36, the number q being given by at least a sequence group number, and
• the sequence group number is determined without the first parameter in a case that the transmission of the physical uplink shared channel corresponds to a random access response grant as part of the contention based random access procedure or the transmission of the physical uplink shared channel corresponds to retransmission of a transport block as part of the contention based random access procedure.